词性转换：
1. have won the football match, because is the best team in the league.（they）
2. It was fine and （sun）yesterday.
3. Li Mei （have）a clock. She （have）it for three years. She （buy）it in a shopping centre. It （not work）well now.
4. By the age of ten, Edison already （build）a chemistry lab for himself.
5. （ride）a horse through the countryside must be very exciting.
1. They, theirs 2. sunny
3. have, has had, bought, doesn’t work
4. had built 5. Riding